<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
  
</head>

<body >
    <button>开始</button>
    <button>停止</button><br>
    <p>100</p>
</body>

</html>
<script>
    //网红倒计时 , 定义一个变量,从0开始增加,增加到100的时候,点击停止即可,停止定时器
</script>